Author(s): Qiang Ma; Changjun Liu; Philippe Gourbesville; Siyuan Chang; Wenjing Lu

Linked Author(s): Philippe Gourbesville, Qiang Ma

Keywords: Hydroinformatic application; Distributed modeling strategy; “23∙7” catastrophic flood; Haihe River Basin

Abstract: In order to comprehensively understand the hydrological processes in the whole water cycle of large river basin, this study proposed a distributed modeling strategy for setting up high performance numerical models over large area to analysis complicated catastrophic flood process. Taking the example of the “23.7” catastrophic flood in Haihe River Basin (320,600 km2), 176 SKY-HydroSAT distributed hydrological models and 8 2D IFMS hydrodynamic models has been set up and used for representing the whole flood process during that disaster. The modelling results show that with the 5 days total rainfall of 49.4 billion m3, the flood disaster happened in Haihe River Basin is mainly caused by the extreme rainfall landed on the Shanxia region in Yongding River (47,000 km2) and the upstream of South branch of Daqing River (43,060 km2). The rainfall-runoff coefficient of those areas almost reach 0.8 with the peak flow of Lugouqiao station (Yongding River) over 4540 m3/s and Zhangfang station (Dqing River) over 7330 m3/s. The fast flood flow produced by the upper stream area of the Haihe River Basin can be concluded as one of the main causes of this flood disaster characterized with relatively higher peak and normal water amount. The distributed hydrological and hydrodynamic models applied in this study show higher preference in shorter time consumption and higher accuracy which already be integrated into the digital twin platform of Haihe River Basin.

DOI: https://doi.org/10.3850/iahr-hic2483430201-258

Year: 2024